RIOK1 and posterior cortical atrophy: The expression of RIOK1 mRNA was greater in the stromal compartment (smooth muscle cells, pericytes, endothelial cells, fibroblasts) compared to that in the epithelial compartment (basal cells, hillock cells, club cells, luminal cells, PCa cells, mixed phenotype cells) (adjusted P = 6.9 × 10−55).